Each design includes three images to use as wallpaper for your desktop. There is an image for a 640 x 480 desktop, 800 x 600 desktop and an image for a 1024 x 768 desktop. Just select the design you would like to download and save image as JPG or PNG. You can then select one of the images for your desktop wallpaper. The images are named 640A, 800A & 1024A or which ever design you select.